diff --git a/crates/polars-core/src/utils/supertype.rs b/crates/polars-core/src/utils/supertype.rs
index 6688428e329c..d50a24cb6649 100644
--- a/crates/polars-core/src/utils/supertype.rs
+++ b/crates/polars-core/src/utils/supertype.rs
@@ -288,7 +288,7 @@ pub fn get_supertype(l: &DataType, r: &DataType) -> Option<DataType> {
                         }
                         // dyn int vs number
                         else {
-                            let smallest_fitting_dtype = if dt.is_unsigned_integer() && v.is_positive() {
+                            let smallest_fitting_dtype = if dt.is_unsigned_integer() && !v.is_negative() {
                                 materialize_dyn_int_pos(*v).dtype()
                             } else {
                                 materialize_smallest_dyn_int(*v).dtype()
diff --git a/py-polars/tests/unit/datatypes/test_integer.py b/py-polars/tests/unit/datatypes/test_integer.py
index 306154e6d936..ec649dd0a87e 100644
--- a/py-polars/tests/unit/datatypes/test_integer.py
+++ b/py-polars/tests/unit/datatypes/test_integer.py
@@ -23,3 +23,9 @@ def test_int_negate_operation() -> None:
         -5,
         -50912341410,
     ]
+
+
+def test_compare_zero_with_uint64_16798() -> None:
+    df = pl.Series("a", [(1 << 63), 0], dtype=pl.UInt64).to_frame()
+    assert df.select(pl.col("a") >= 0).item(0, 0)
+    assert df.select(pl.col("a") == 0).item(0, 0) is False